式中:R为气体常数,丁为绝对温度,K为热力学常数.
根据不同温度下的吸附实验结果,计算相应的热力学参数值见表3.吉布斯自由能是判断吸附过程能否自发进行的基本条件,由表3可以看出,花生壳活性炭吸附活性艳蓝的吉布斯自由能AG<0,说明花生壳活性炭对活性艳蓝的吸附过程可自发进行;AH>0,说明该吸附过程是吸热的,升高温度有利于吸附;AH绝对值在2.1—
20.9
kJ/mol,吸附机理表现为物理吸附;△S>0,说明该吸附反应是熵值增加的过程.
万方数据
第11期王丽敏,等:花生壳活性炭对水溶液中活性艳兰染料的吸附
103
艳蓝的吸附动力学行为,相关系数超过0.99.(3)花生壳活性炭对活性艳蓝的吸附等温线符合Freundlich模型;吸附的热力学行为表明,该吸附可以自发进行,吸附过程是吸热的,吸附作用主要表现为物理吸附;吸附反应是熵值增加的过程.
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81J
KhaledA.,AhmedE.N.,AmanyE.S.,eta1.Treat.
AdsorptionofReactiveBrilliantBluefromAqueousSolution
byPeanutHullActivatedCarbon
WANG
(College
Li-min,ZHANGYong-qian
132022,China)
ofResourceandEnvironmentEnglneefing,JilinInstituteofChemicalTechnology,JilinCity
Abstract:Activatedcarbonpreparedfrompeanuthullusingphosphateadsorbent
to
asan
activator
at
400℃wasutilized
to
as
removereactivebrilliantbluefromaqueoussolution.Batchexperimentswereconducted
on
study
theeffectsofpH,adsorptiontime。andinitialconcentrationofadsorbatereactive
reactive
brilliant
blueadsorption.
Theresultsshowthattheadsorptionequilibriumofpeanuthullactivatedcarbonreachedwithin90minfor
brilliant
blueconcentrations
of100mg/L.The
equilibriumdatain
aqueous
solutionswerewell
representedbytheFreundlich
models.Themg/g.ne
pseudo—secondorderequationprovidedthebettercorrelationofthe
usedexperimentaldata.Theadsorptioncapacityofreactivefound
to
be
as
high
as
482.8
thermodynamic
brilliantblueontopeanuthullactivatedcarbonconstantsoftheadsorptionprocessAH.AGandAS
on
wereevaluated.These
showthatadsorptionofreactivebrilliantbluepeanut
as
hullactivatedcarbonwas
spontaneous.Thepeanuthullactivated
carbon
wasfoundtobeveryeffectiveadsorbentforreactivebrilliant
bluefromaqueoussolution.
Keywords:peanuthullactivatedcarbon;adsorption;reactive
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